Porphyritic Texture

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Porphyritic Texture

the texture of a rock in which relatively large phenocrysts with regular crystal faces are set in a generally fine-grained groundmass. Rocks with porphyritic textures may be extrusive or intrusive. An extrusive rock with a porphyritic texture has a groundmass that contains an unequal number of phenocrysts and consists of either microlites or glass. An intrusive rock with a porphyritic texture has a finely crystalline and granitic groundmass; for this reason it is also called a granite porphyry.

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